Thoroughfare tap-holder.



No. 880,529. PATENTED R; 3, 190 s.

- H. HEYNAU.

THOROUGHFA'RE TAP HOLDER;

" APPLIGATION EILED APR.10, 1907.

QIIIC HANS HEYNAU, OF DOTZHEIM, NEAR WIESBADEN, GERMANY. i

' THOROUGHFARE TAP-HOLDER.

Application filed Api-il 190'7. Serial No. 367333.

To all whom it may concern: I

Be it known that I, HANs HEYNAU, engineer, a subject of the King ofSaxony,.residing at Dotzheim, near Wiesbaden, in the. Kingdom of Prussiaand German Empire, have invented new and useful Improvements inThoroughfare Tap-Holders, 'of which the" following is a specification-My invention relates to anin'iproved tap holder, designed moreparticularly for use in tapping thoroughfare holes in wholesale work.

The invention is illustrated in the accompanying drawing, in whichFigure 1 is an elevation, partly in section, of the new holder. 2 is anelevation, the holder being viewed at right angles to Fig. 1. Fig. .3 isan underside view of the holder. Fig.4 isan end view. Fig.fiisasection'of a socket to be hereinafter referred to.

Fig. 6 is a cross-section through the socket on the line A B of Fig. 5,and Fig. 7 shows a small steel Wire spring. I The top part of the holdera is conical and may be fitted into an ordinary drillin 2 machine. Thelower portionis recessed an receives a sliding headb, caused to partakeof the rotary motion of the holder by means of a feather c, and. havingan internal square ada ted to-receive the ta hen the tap has cut tiirouh the hole, the descending head I) is forced own uponthe work and isconse uently pressed back into the recess in the ho der. Into the bottomof the recess there isscrewed a in d, which when the head I) has. beenpushedbaok against Specification of Letters Patent.

the recess bottom, knocks the tap out of the 1 Patented March 3, 1908.

the machine. On the holder (1 being run up,

the head I) is retilrned to its initial position by. a spring f, coiledround the pin 11, the one end bearing against the bottom of the recessand the other end against a disk g resting upon the square in the headI). The tap can now be reinserted in the head.

In order. to adapt the holder for ta s of holder o so that it drops uponthe table of' different sizes, sockets such as shown in igs. 4 and 5 maybe inserted in the head I).-

.These sockets have an external square hdapted to fit the head b andan.internal square to receive the tap in use. The entire holder. is madeof magnet steel and strongly magnetized, so that the taps and socketsmay be effectiwelyprevented from dropping out. If desired, small springs.9 made of steel wire may be inserted in the head and socket as shown inFigs. 1, 5 and 6 to serve the same puWose asm 'netization. r hat I do 0aim as my invention and desire to secure byfLetters- Patent, is f A tapholderipomprising a shank having a recess, a pin {projecting thereintoand a spring actuated tap receiving head having a" bore slidable in" therecess and splined tothe shank. I I

In testimony whereof. I have signed "my name to this specification inthepresence of two'subscribing HANSHEYNAU;

Witnessesf 1 j. GUSTAV SEssELnERG,- w, Fmnnnaron WILHELM Oneness. f

